Question: When did French Guiana have a population of 66977?
Paraphrase: At what time French Guiana's population reach 66977?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q3769 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '66977.0')) . ?s pq:P585 ?value}